No. "Because it's future proof" should never be a reason for buying anything. Buy because it is uselful to you now, or wait until you need it and buy the best at that time.
Now what IS insane is TV companies' expectations that people would upgrade their TVs every 1-2 years like they would a phone or laptop. The use case for TVs is not changing fast enough to warrant this; HD -> Full HD -> 3D -> 4K are becoming less and less effective rationales for upgrading.
@Zappykins
The plateau is here already with HD. Most people's eyesight and living room size don't justify anything bigger especially with a >$1000 price tag attached.
We have also reached a demand plateau in desktop CPUs (2006, Core 2), video game graphics (2006, 360), laptop PCs for non-gaming (2011, Sandy Bridge). We haven't reached it for smartphone/tablet performance or battery life which is why those devices are 'hot'.
